Glue for mounting optics to metal?

I need to mount some optics to metal parts, does anyone know what is the appropriate glue/epoxy used for this?

It would also be nice if I could remove the optics/glue at a later time if necessary.

If you have any insight, please let me know, thanks!

I used 2 part 5 min epoxy to mount the optics in my combined yellow build. Worked very well esp. After roughing up the metal surface with some 1 - 2000 grit paper. To remove, I slid a thin knife between the Alu and the glue to prise them free again. The optics survived multiple adjustments (probably around 30-40 times!) without damage. The glue was called poxipol.:beer:

Edit: The epoxy may have been the 10 min version, Ill check this for you in the morning . Eitherway you need a relatively quick setting epoxy, but one which still gives you time to make fine adjustments to the optics. If its too quick you dont have much time, slower and they will probably move before its had time to set. You probably know this, but just in case - super glue is a bad idea.

Thanks for the tip! That Poxipol isn't available here, but I should be able to find some 5-10 min epoxy equivalent. I'm also glad that it can be removed if necessary!

Epoxy is everywhere now. As he said, all you need is a razor and you can get it released. I've done it many many times.
I also increase the surface area too to increase the glue strength just as Grainde says although sometimes I use a Dremel depending upon the material and what you are trying to glue. Use epoxy on all the drivers to diode press sinks on the corners to keep the driver aligned and so there's no potential twisting when putting a laser together in case one part spins and the other doesnt. It's really not necessary if you are really careful but I do it anyways.